Characterization of MHD behavior in a low-aspect ratio RFP
نویسندگان
چکیده
MHD properties of low-aspect-ratio (low-A) reversed field pinch (RFP) plasmas have been studied in RELAX machine with aspect ratio of 2. The MHD behavior appeared in edge magnetic field fluctuations shows strong dependence on toroidal field reversal. In standard or deep-reversal plasmas, the edge magnetic fluctuation has broad toroidal mode spectrum, while it is narrowed by reducing the toroidal field reversal. The spontaneous transition to quasi-single helicity state is realized in shallow reversal discharges. The results may suggest that shallow-reversal operation is desirable to realize favorable characteristic of low-A RFP configuration.
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